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What is a 6 axis IMU?
An IMU is a specific type of sensor that measures angular rate, force and sometimes magnetic field. IMUs are composed of a 3-axis accelerometer and a 3-axis gyroscope, which would be considered a 6-axis IMU. They can also include an additional 3-axis magnetometer, which would be considered a 9-axis IMU.
What is inside an IMU?
1 Inertial measurement unit (IMU) The IMU is a sensor that measures triaxial acceleration and triaxial angular velocity. The IMU consists of an accelerometer, which can output linear acceleration signals on three axes in space, and a gyroscope, which can output angular velocity signals on three axes in space.
What kind of IMU is a 3 axis magnetometer?
They can also include an additional 3-axis magnetometer, which would be considered a 9-axis IMU. Technically, the term “IMU” refers to just the sensor, but IMUs are often paired with sensor fusion software which combines data from multiple sensors to provide measures of orientation and heading.
How does sensor fusion work in an IMU?
Sensor fusion is the (mathematical) art of combining the data from each sensor in an IMU to create a more complete picture of the device’s orientation and heading. For instance, while looking at gyroscope information for rotational motion, you can incorporate an accelerometers sense of gravity to create a reference frame.
Where is the IMU located on a cell phone?
On our phones, usually, an IMU with a 3-axis accelerometer is used to sense the direction on which the gravity is acting on. Have a look at the picture below. As you can see in the picture, the IMU chip is placed inside the phone and it usually has 3 accelerometers placed in 3 directions.
Why is data collected from IMU so important?
The raw data collected from an IMU gives some idea of the world around it, but that information can also be processed for additional insight. Sensor fusion is the (mathematical) art of combining the data from each sensor in an IMU to create a more complete picture of the device’s orientation and heading.